Tuning peg for stringed musical instruments



July 23, 1929. GRQVER 1,721,904

TUNING PEG FOR STRINGED MUSICAL INSTRUIENTS Filed Oct. '7, 1924 g- FI-2.

z ,5 1* Kw I4 l 15 I /a H I (5 ""1 4 H Patented July 23, 1929 UNITEDSTATES ALBERT I). GROVER, OF NEW YORK, N. Y.

TUNING PEG FOR STRINGED MUSICAL INSTRUMENTS.

Application filed October 7, 1924.

My invention relates to improvements in tuning pegs for stringed musicalinstruments.

The invent-ion relates more particularly to that type of peg whichincludes a shank re ceived in a suitable opening in the peg head, abutton or knob by which the shank is turned, and a cup member embracinga part of the shank with one end of the cup engaging the peg head andthe other end of the cup engaging the button. The principal object ofthe invention is to provide for etlective engagement of the cup andbutton and I accomplish this object byserrating that edge of the cupwhich engages the button whereby the serrations will penetrate therelatively soft material of which the button is usually made and producean effective interlocking of the parts.

The invention is illustratively exemplilied in the accompanying drawing,in which Figure 1 is a sectional view of a part of a peg head showing myimproved tuning peg in elevation and in operative position. Figure 2 isa substantially longitudinal sectional view of the peg taken on lines2-2 of Figure 1; Figure 3 is a substantially transverse sectional viewtaken on line 33 of Figure 1; Figure 1 is a transverse sectional viewthrough the button and shank and taken on line H of Figure 2; and Figure5 is a view of a slightly modi lied form of my invention.

teferring to the drawings and particular- .ly to Figures 1 to 4:inclusive, the tuning peg comprises a shank which operates in an opening11 in the peg head 12 of an instrument. The shank 10 is constructed ofone piece of material and has a shoulder or enlargen'ient 13 which isgreater in diameter than the opening 11 in the peg-head 12, and which istapered off on its under side to frictionally engage the walls of theopening 11. Above the shoulder 13 the shank is provided with anextension 1 1 having the usual hole 15 for receiving the end of astring. Below the tapered portion of the shoulder 13 the shank is ofuniform diameter to loosely lit the opening 11, and at a pointsubstantially below the under face of the peg head 12 the shank isreduced in cross section and squared all the way to the end, the squaredsection designated 10, being provided with a threaded axial bore 13projecting substantially throughout its length.

A button 17 having the usual broached square hole 18 is mounted on thesquare section 10 and a screw 19 having its head seated. against thecrown of the button is adjustable Serial No. 742,102.

at its opposite end in the threaded bore 16 of the shank.

Mounted on the round section of the shank projecting below the peg head12 and between the latter and the butt end of the button 17 is a sleeve20 which comprises a metal cylindrical member having a cone-shaped end21 adapted to seat in and frictionallv engage the wall of a counter-sunksection 22bit the opening 11 at the under face of the peg head Theopposite or lower end of the sleeve :20 projects over the square section10 and is provided with a serrated surface 20 adapted to bite in theadjacent butt end of the button 17 when the screw 19 is tightened totelescope the sleeve over the shank and into frictional engagement withthe intermediate section of the peg head 12.

It will be clear that the present construction permits the serratedsurface 20 of the sleeve 20 to bite in the soft celluloid, rubber orbone material from which the button is gen.- erally made and that afterproper setting of the screw 19 the tuning peg virtually becomes anintegral member provided with oppositely projecting tapered surfaces,which maintain a constant relation to each other and to the walls of thetapered portions of the opening 11 in the peg head. This coi'istructionaltords a great saving in manufacture due to avoiding the step whichconsists of broa chin g a square hole in the sleeve and then squaringthe shank to fit the same, a process which is general in tuning pegmanufacture. The invention also does away with all lost motion when thepeg is being adjusted to turn a string, because of the fact as alreadystated, that it becomes an integral unit all the elements of which movetogether.

In Figure 5, I have shown a slightly modified embodiment of my inventionwhich con sists in providing a washer 23, having one surface thereofserrated, and the other provided with lugs 24 which are adapted to lockin slots 25 disposed radially in the under surface of the sleeve 20, theslots being substituted for the serrations of the preferred form. Thewasher 23 is placed betwen the sleeve 20 and button 17 so that as thescrew 19 is tightened the button washer, sleeve, and shank become as oneunit in the manner already described.

lVhat I claim is l. A tuning peg for stringed musical. instruments,comprising a shank, and cooperating members therefor, comprising asleeve provided with serrations, and a button of softer material thanthe sleeve the serrations thereof biting into the button to present anonslip relation between the sleeve and button.

2. A tuning peg for stringed musical instruments, comprising a shank,friction means carried by the shank and having a serrated surface, abutton of softer material than the friction means, and means foradjusting the button over the shank to cause'the serrations to bite intothe softer material of the button to present a nonslip relation betweenthe friction means and button.

3. A tuning peg for stringed musical instruments, comprising a shankhaving a tapered surface adjacent one end and a bored square section atthe opposite end, a button of relatively soft material having a squarehole to receive said square section, a screw projecting through saidbutton and adjustable in the bore of the square section to move thebutton towards the tapered surface of the shank, and an intermediatemember mounted on said shank and provided with a tapered frictionsurface opposed to the tapered surface of the shank and having aserrated surface to engage and penetrate the softer surface of thebutton under tightened adjustment of the screw to present a non-sliprelation between the friction means and button.

4. A tuning peg for stringed musical instruments, comprising a shank aportion of which is shaped to enter a peg hole in a peg head, a buttonof relatively soft material disposed on said shank, and a sleeve memberinterposed between the peg head and button, one end of the sleeve memberengaging the peg head and the other end of the sleeve memher having aserrated surface to bite into the softer adjacent surface of the buttonto establish a non-slip relation of the cup member and button.

In testimony whereof I afiix my signature.

ALBERT n; GROVER, v

